Improvement in machines for refitting valve-seats



' UNITED STATES wn 'rnrrr @rica IVILLIAM IV. ALLMAND, OF EAST BOSTON,MASSACHUSETTS.

IMPROVEMENT IN MACHINES FQR REFIT'TING VALVE-SEATS.

Specification formngpart of Letters Patent No. ls, dated February 17,1874; application tiled January 30, 1874.

To all whomJ t may concern Beit known that I,W1LL1AM W. ALLMAND, of EastBoston, in the county ot' Suffolk and i.1 the State of Massachusetts,have invented certain new and useful Improvements in Machines forRetting Valve Seats; and do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, making a part of this specification, in which-Figure l is a perspective view of my appaatus as arranged for use,andFig. 2 is a central longitudinal section of the same in positionwithin and upon -the body or easing of a valve.

Letters of like name or kind refer to like parts in each of the figures.

The object of my invention is to enable the seats of globe-valves to bedressed or restored to their'original shape without removing the casingsof said valves from position; and it consists, principally, in thecombination of the swiveled many-sized head or mandrel-bearing with theyoke or frame for containing` the feedscrew, substantially as and forthe purpose hereinafter speciiied. It consists, further, in thecombination of the mandrel head, frame, or yoke, feed-screw, andmandrel, substantially as and for the purpose hereinafter shown. Itconsists, finally, in the apparatus as a Whole, its several parts beingconstructed and combined to operate in the manner and for the purposesubstantially as hereinafter set forth. In the annexed drawing, Arepresents the frame of my machine, consisting of `two parallel bars,connected together at one end, and provided in and through said end witha threaded opening, a, which receives a corre spondingly-threadedfeed-serew, B. Within the opposite open end of the frame A is placedv acylindrical head, C, which, by means of two trunnions, o and c, ispivoted within corresponding openings, a', formed in said frame, and iscapable of being turned so as ,to bring either end below or outside-ofsaid frame. Upon the periphery of the pivoted head C, upon each side ofits longitudinal center, are

formed a series of steps, c', each of which is threaded cxteriorly, andcorresponds in diameter to one of the sizes of the openings in the casesof globe-valves, through which the valves are inserted, the number ofsaid threaded steps being such as to enable said head to be insertedwithin and caused to fill any such opening within a valve-easing of'usual size and construction. A circular opening, c,- passing throughthelongitudinal axis of the head C, receives a mandrel, D, upon one endof which is secured a cutter, E, that corresponds in size and shape tothe `like features of the valve-seat to be dressed, whileat its oppositeend said mandrel is squared, so as to receive the toothed disk f of aratchet-lever, F.

The machine is now ready for use as follows: The mandrel is placed inposition within its head, with its cutter end outward and its squaredend, containing the ratchet-lever, against the pointed end of thereed-screw, after which said head is inserted within the opening of avalve-casing, and screwed to place. The feed-screw is now turned inwarduntil the cutter is brought into contact with the valve-seat, ,and saidcutter then caused to revolve by means of the ratche=t-lever, the

contact between said cutter and seat being rendered suiiiciently closeto cause the surface of the latter to be cut away. as much as p may berequired in order to render it true.

It will be seen that the feed-screw not only moves the mandrel andcutter inward, but also holds the latter rmly against `the seat beingoperated upon, and prevents chattering or other faulty operation, inconsequence of which said seat receives the required surface, instead,as would otherwise be the case, ot' being uneven and incapable offorming a close joint with the valve.

By use of the ratchet-lever, the machine can be operated in positionswhere it would be inipracticable to employ the usual brace.

Having thus fully set forth the nature and merits of my invention, whatI elaim'as new 1sh l. In combination with the frame A, the swiveled orpivoted head C, provided with the threaded steps c c and central openingc", substantially as and for the purpose speci- 2. The frame A,feed-screw B, head C, c, c, and c, and the mandrel D, constructed andcombined to operate substantially as and for the purpose shown.

3. The frame A, feed-screw B, head C, c, c', and c, mandrel D, cutter E,and ratchet-lever F, said parts being constructed as shown, and combinedto operate in the manner and for the purpose Substantially as set forth.

In testimony that I claim the. foregoing I have hereunto serJ my handthis 31st day of December, 1873.

VILLIAM YV. ALLMAND.

IVitnesses: V

W. J. MOORE, WILLIAM MILLER.

